you are on the tight website, that's for sure. I suggest since you are new here, you first look op the spudwiki section (link in the banner on top of this (every) page. You can learn a lot from there. Better to understand what you do, than just let us tell you to do something, not knowing what you are actually doing in the first place. That could be dangerous

PCGUY wrote:Each pressure chamber is connected to a 2" in-line sprinkler valve via a 2" union. These valves are modified to trigger pneumatically by a 1" Rainbird sprinkler valve, which is also modified to trigger pneumatically.